Portable chain saw



June 24, 1930. DAW 1,766,013

PORTABLE CHAIN SAW Filed Dec. 28, 1926 Patented June 24, 1930 UNITEDSTATES PATENT OFFICE JOSEPH DAW, OF QUEBEC, QUEBEC, CANADA, ASSIGNOR TOBROWN COIPANY OI BERLIN, NEW HAMPSHIRE, A CORPORATION 01 MAINE roa'rnanexam saw Application filed December 88, 1926. Serial No. 157,468.

This invention relates to an improved portable power saw and is animprovement on a saw designed for similar purposes and disclosed in myPatent No. 1,598,853 issued September 7, 1926. Saws which are poweroperated save considerable time and labor where it is possible to usethem. By my invention, I provide a power-operated saw which is ofsufliciently strong construction to be used for felling trees and forcutting up felled trees into lengths and which can be carried around andoperated by one man without difiiculty. Among the various uses to whicha saw of this type is particularly 5 adapted is that of sawing up logsas they lie in a pile. Heretofore it has been the practice in the woodpulp industry to drag the 10 s from the pile one at a time and pressenttl lem to a stationary power driven uzz saw or to cut them by hand. Thisinvolves unnecessary handling with consequent waste of time and labor,all of which add to the expense of procurin the pulp wood. My inventionis adapte to be used on log piles, its ready ortability enabling an oerator to saw u t e logs in the pile rapidly by simply bloc 'ng them upone at a time to clear the rest of the logs on the pile during thesawing operation. Various other uses and advantages of my saw willsuggest themselves to one skilled in the art from the disclosure thereofcontained in the following description and on the drawing, of which,

Figure 1 is a side elevation of the device.

Figure 2 is a section on the line 2-2 of Figure 1.

Figure 3 is a section on the line 3-301 Figure 1.

Figure 1 is a fragmentary detail on a larger scale of a portion of oneof the sprocket wheels. I

Figure 5 is an elevation of a portion of my improved saw chain.

Figure 6 is a section taken on the line 6-6 of Figure 5.

Figure 7 shows in perspectivelone of the links for holding the sawelements in the chain together. 7

Figure 8 is a fragmentary perspective of 'a pair of links showing thealining structure on the ends of the shanks.

Referrin to the drawing in detail, the saw com uses a chain composed ofa number of hnks, each of which are provided with saw teeth, these linksbeing held together by pairs of connecting links. The chain as a wholeis passed ed ewise over the periphery of two sprocket w eels which areattached securely to a frame and forms two parallel stretches betweenthe wheels. One of these wheels is power driven by any suitable means,the other wheel being an idler. In Figure 1 the ower driven wheel isshown at 10,-the idler eing designated as 11. A doubled, arched frame 12straddles both these wheels and sup rts them in a common plane. From eacof the arched frame members 12 a reaction member or bar 13 extendsdownwardly, this bar being connected as by a horizontal strut 14 withone end of the arched frame member 12 at the hub of wheel 10. The bar,13 is extended as at 15 below the saw chain and thus provides a supportto rest a ainst a log and take the reactive pressure t erefrom caused bythe resistance to the cutting action of the saw. A suitable bearing forthe wheel 10 is provided for at the junction of the strut 14 and theframe member 12, this bearing bein of any desired construction. As shownin igure 2, it may com rise a pair. of ri 16 formed on or attac ed tothe frame. ithin these. bearing rin is mounted the hub, of the wheellOwhic may comprise a pair of complementary collars 17 secured together bysuitable bolts 18 and adapted to clamp between them the web of thewheel. In order to provide a wheel which is both light, strong, andeasil constructed, this web may comprise a p ate 19 of suitable shape oneither side of which is secured by riveting, spot weldin or otherwise athin late 20, this pair 0 thin plates forming nges 21 on theperiphery'of the wheel between which the chain is adapted to bereceived. The flanges are preferably extended radially outward beyondthe ends of the teeth inthe chain so as to serve with a portion of theframe 12 as a guard to protect 100 an o erator from the portion of thechain which .is not actually in cutting position. The wheel 10 may bemounted on a power shaft 22, bei keged thereto if desired by a key 23whic is tted into complementary grooves in the shaft and in the hubmem-.

may be bolted, riveted, or otherwise secured,

a p a te 25 to the peripheral portion of which -a pair of flanges 26 aresecured as by suitable rivets 27 or any equivalent means. The flanges 26extend radially outward beyond the ends of the saw teeth and thus serveas a guard in the same way as do the flanges 21 of the wheel 10. Thewheel 11 is loosely mounted on a fixed shaft 28 to each end of which issecured 'a block 29. The frame members 12 which straddle the wheel 11extend downwardly between the hub member 24 of the wheel 11 and theblocks 29. These members 12 are also provided with extensions 30 whichproject radially outward beyond the periphery of the wheel 11 and arejoined at their outer ends by a suitable block 31 throu h which pass apair of rods 32, each of t ese rods 32 being secured to one of theblocks 29. The outer ends of the rods 32 are preferably threaded as at33 and are provided with nuts 34 which enga e the outer face of theblock 31 'and may e adjusted to move the wheel 11 bodily away from thewheel 10 and thus to ut tension on the saw chain, the junction 0 theframe end with the extensions 30 having horizontal slots to permitadjusting movement of the blocks 29. Y

The construction of the chain itself is indicated in Figure 5. As showntherein, the chain comprlses series of links 35, each of which comprisesa central shank 36 on one side of which a number of saw teeth 37project, on the other side of which a air of ugs 38 roject. To theselugs are pivotall attache connecting links 39 which are pre erably suplied in pairs between successive links 35. ach rojection 38 on a linkhas cut into each face thereof a recess of sufiicient depth to receivean end of a link 39 so as to permit the outer faces thereof to lie flushwith itsown faces. As the end portions of the links 39 are of circularcon-,

tour asat 40, the-recesses in the projections 38 which receive the ends40 are also circular in shape, one side being cut away as at 41 toreceive the shanks of the links 39, the cut-away portion also beingflared to permit the link 39 to turn on the rivet 42 which pivotallyconnects it with the link 35. Figure 6 shows in section the relativearran ement of a pair of connecting links 39 an a pair of successivelinks 35 to which they are connected. Each pair of l' s 39 is preferablystrengthened by a small rivet 43 which connects their m1d points andstifiens them mutually. As shown in Figure 5, the flared cut-awayportions in the projections 38, which permit limited pivotal movement ofthe links 39, do not extend to the full diameter of the circularrecesses which receive the ends 40 of the links 39. As a result, thepulling stresses on the links 39 are borne by the ends 40 and not by therivets 42 which hold the links in lace. This results in a strongerconstruction of the chain. The ends of the shank portions 36 of thelinks 35 are preferably formed with a double bevel edge 48 at one endand a recess 49 at the other to receive the end edge of the nextadjoining link 35. This arrangement of interfitting of edges andrecesses results in keeping the successive teeth properly aligned whenthe links are straightened into line after passing around a wheel.Between successive projections 38 on each link 35 is ra hollow 44 andthe peripheries of the wheels 10 and 11 are formed with suitablesprockets 45 to fit into the hollows 44 between the projections 38. Thisresults in a positive drive of the chain.

On the bridge members 12 over a portion of the wheel 10 a suitablehandle 46 may be mounted to enable the operator to steady the apparatuswhile it is o erated and to ca t e apparatus about. tional handle 47 maybe secured to the block 31 in case a second operator assists'in theoperation or transportation of the saw.

Having thus described an embodiment of my invention, it should beevident to those skilled in the art that various changes andmodifications may be made therein without departmg from its spirit orscope as defined by the appended claim.

I claim I A chain saw comprising a lurality of saw-toothed links and apair of connecting lmks between each twosuccessive toothed links, saidtoothed links each having at each f desired, an addleach said circularsaid responding recesses in the toothed links the outer faces of saidconnecting links and the end faces of said fastening elements beingflush with the side faces of said toothed 5 links.

In testimony whereof I have aflixed my signature.

JOSEPH DAW.

